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Hello,
is there a way to use threema web when the vpn is active?
I think the problem is web rtc, if web rtc are disabled, threema web does not load.
Can i set applications on a whitelist or something? Or a other way to use threema web when the vpn is active?

WebRTC is a technology that allows for browser-to-browser interactions not previously possible with other standards.
A serious privacy issue has been found in WebRTC. This issue allows for websites see the local IP address of a user. This is a major concern as it allows for unique identification of users behind NATs, VPN, and potentially Tor. The proper browser extension disables or configures WebRTC to not use certain IP addresses like an ISP-provided address, when browsing through a VPN). You can test this here. https://diafygi.github.io/webrtc-ips/ Your local IP address should not appear.
Please patch your browsers.
Chromium: WebRTC Network Limiter: Chrome Store
Firefox: Disable WebRTC configures WebRTC to not use certain IP addresses like an ISP-provided address, when browsing through a VPN). You can simply disable WebRTC in Firefox:
Enter "about:config" in the URL bar
Find the key of "media.peerconnection.enabled"
Set the value to "false"
But it may reset after each update. Which is why I recommend installing Disable WebRTC
Disable Web RTC: Mozilla Store or https://addons.mozilla.org/en-US/firefox/addon/happy-bonobo-disable-webrtc/
Firefox mobile: Disable Web RTC: https://addons.mozilla.org/en-US/android/ TorGuard should send emails to all clients about this vulnerability and add info on this to the set-up instructions.